/usr/local/bin/php High CPU Load, is it "Normal" ?

[dedieko]

Hello Everyone
Need some advice here

My Current System :
Celeron 2 giga, 512 Mb DDR1
Hdd 20G IDE
PFSense 1.2 BETA
2 Interfaces WAN and LAN
Captive Portal ON with free radius
approx. 70 users are logged in simultan.
30+ users are pass MAC through
the rest is mobile user with laptop
Add-on installed:
Squid, Free Radius

Here my Process list:

ps uax

USER    PID %CPU %MEM  VSZ  RSS  TT  STAT STARTED      TIME COMMAND
root      10 40.1  0.0    0    8  ??  RL  12:39PM  7:39.49 [idle: cpu0]
root  13011 14.5  3.1 18996 15860  ??  S    1:20PM  0:02.89 /usr/local/bin/php
root  12988 12.4  3.0 18320 15192  ??  R    1:20PM  0:07.94 /usr/local/bin/php
root  12782 11.0  3.5 20724 17620  ??  S    1:19PM  0:14.95 /usr/local/bin/php
root  12832 10.0  3.5 20724 17620  ??  S    1:19PM  0:11.04 /usr/local/bin/php
(complete list in attachment - process.txt)

these 4 processes always on this state of load, sometimes it could rise up to 100% of CPU load
(I've taken a screen shot of RRD Graph - cpuload.jpg)

QUESTION :
Is it normal to have this kind of process load in my system? :

process.txt

[sullrich]

Using captive portal, yes.

[dedieko]

Oke , sensei Ullrich

Thanks a lot